Joseph sherman



J. SHERMAN.

GRATE BAR.

Patented May 28,1867.

JOSEPH SHERMAN, OF BURLINGTON, NEW JERSEY.

Leners Parent No. 65,289, dared may 28,1867.

IMPROVEMENT IN GRA'IE-BAR.

@In ,Stlgrhnle Istant it in that Estan aimt mit marking pnt nt the snm.

T O ALL WHOM IT MAY OONOERN:

Be it known that I, JOSEPH SHERMAN, of- Burlington, in the county of Burlington, and State of New Jersey, have-invented a new and useful Improvement in Grate-Bars; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being hadv to the annexed drawings, melting part of this specication, in whieh- Figure 1 is a perspective view of a horizontal grate-bar.

Figure l is a perspective view of a horizontal grate-bar with a vertical extension.

Figure 3 is a vertical longitudinal section of the same.

The same letters are employed in all the {iguresin the indication of identical parts.

The object of this improvement is to provide a moro equal distribution of the draught over the surface of the burning fuel, .and to protect the furnace-walls from the action of the fire.

The horizontal grate-bar A is constructed as a tube, permitting afree circulation of air through the gratebar, entering at the end at B, and passingpout through u series oi' small openings, a a a, in each side ofthe bar, and also on the upperside, or the side next the fire. Thejets of air passing out of the orices a a are mingled immediately with the gaseous products of combustion, facilitating their inflammation, and at the same time the circulation of cold currents of air through the tubular grate-bars tends to keep down their temperature and preserve them from the destructive action of the tire. To permit the removal of ashes' and other line substances falling into the tube through the orifices a a, an opening, C, is made at the back end of the grate-bar through its lower surface, or through the end `from which such accumulations may he expelled by the introduction of a rod through the opening B. The grate-bar described is a horizontal grate-bar. I prefer, however, to construct them with a curved exterior, and in one piece, the whole bar in this case beingconstructed as already described as to the internal tube and orifices. This form of construction is shown at D, in figs. 2 and -3, and is valuable for the protection of the furnace-Walls from the action ofthe intense heat of the fires, and also in producing a more perfect circulation of atmospheric air through the burning fuel.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The horizontal tubulaigratebars A, open at B, and constructed with small orifices a a, for the escapo of the air on the three sides nearest the tire, and also with an opening, C, at or near the rear end, substantiallyas and for the purpose set forth.

2. Ventilated grate-bars, constructed with u vertical tubular and perforated extension, D, of the horizontal tubular portion of the bars A, substantially-as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH SHERMAN.

Witnesses r R. MASON, vTous S. HOLLINosnnAn. 

